License

CC-BY-NC-SA 3.0

Tesseract Guitar Practice Amp

2 years ago 7654
  • Description
  • Documents
  • BOM
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Description

The EasyEDA "Tesseract" DIY Guitar Practice Amplifier is an LM386 based low power amplifier designed to deliver up to about 500mW into an 8 Ohm speaker when run from a 9V battery.

Tesseract can be heard on YouTube here:

https://youtu.be/9XzodyefyV8

The design given here - which includes a complete PCB design and Bill of Materials - is highly flexible and allows the several options in both the build and use of the amplifier.

As well as a clipping circuit that some other designs - such as the more well known Smokey, Little Gem, Ruby and Noisy Cricket - have incorporated, Tesseract has several unique effects features designed into it:

  • Selectable Bipolar or Junction FET input stage for different input overload effects;

  • Adjustable gain and clipping 'hardness' in the Distortion stage;

  • An adjustable fullwave rectifier stage, driven by the distortion output, that generates a type of fuzz and frequency doubling effect called 'Wreckage';

  • An optional low frequency oscillator stage to sweep the Wreckage effect;

  • A simple mixer to blend the 'Wrecked' and the 'Distortion' outputs;

  • Selectable, adjustable low or high frequency boost (a type of tone control);

  • An important aspect of the design is that all the features and FX can be tweaked for your delight and delectation.

  • Most features are also optional and can be wire linked out if not required without affecting the other functions.

  • The design could easily be modified to suit the LM380 2.5W or LM384 5W amplifier chips (although the Boost function would have to be omitted) or a range of other devices.

  • The design also includes a headphone output jack.

  • The PCB includes dual footprinting to simplify the choice of some of the components.

  • All parts (excluding the PCB) are available from: http://www.bitsbox.co.uk/ (Bitsbox can also supply suitable small switches, loudspeakers and battery holders or clips.) An alternative for J1 as an MPF102 is available from: http://www.tandyonline.co.uk/components/semiconductors/transistors/mpf102-jfet.html

  • Simulations of the different stages of this amplifier - and a copy of the EasyEDA LM386EE spice model used in them - can be found here:

https://easyeda.com/example/Tesseract_Guitar_Practice_Amp_simulation_files-H0ca8IFDB

To order Tesseract PCBs direct from EasyEDA

Sign up for a free account at:

https://EasyEDA.com

then click on 'Fork' or 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:

Fabrication Output...

Then click on the Save To Cart button on the Add To Cart page:

Save To Cart

Then follow the instructions on the

Home > My Account> Cart

page.

Orders can be tracked on the

Home > My Account> History Orders

page.

To download Gerbers for 3rd party PCB fabrication

Click on 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:

Fabrication Output...

Then click on the Download Gerber Files button on the Add To Cart page:

enter image description here

  • Please note that this project is subject to the CC-BY-NC-SA 3.0 license. For more information please see:

https://creativecommons.org/licenses/by-nc-sa/3.0/

Documents

Tesseract Guitar Practice Amp Schematic

Tesseract Guitar Practice Amp PCB

BOM

ID Value Qty. Package Components Manufacturer Part Bitsbox Order Code Description
1 10k 7 RC07 R15,R14,R2,R7,R26,R24,R1 Various MR2510K 10k 250mW Metal Film 2% or better.
2 51k 8 RC07 R12,R4,R5,R8,R27,R31,R21,R11 Various MR25100K 100k 250mW Metal Film 2% or better.
3 100p 1 C_MLCC_RES_DIP_5.5x3mm_P5mm C9 Various NPO100P 100pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
4 2N5458 1 TO-92 J1 2N5458 QD071 2N5458 N channel JFET in TO-92 package.
5 BC547 7 BC547 Q1,Q2,Q3,Q4,Q5,Q6,Q7 BC547B QD011 BC547 NPN BJT in TO-92 package.
6 1Meg 7 RC07 R3,R17,R16,R32,R36,R37,R19 Various MR251M 1M 250mW Metal Film 2% or better.
7 1Meg_LOG 2 POT_BITech-TTE_P160KN RV2,RV1 Various VR045 1M Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
8 10p 1 C_MLCC_RES_DIP_5.5x3mm_P5mm C5 Various NPO10P 10pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
9 100k 10 RC07 R6,R29,R28,R33,R30,R18,R9,R34,R35,R20 Various MR25100K 100k 250mW Metal Film 2% or better.
10 SWITCH_SPDT 2 HDR1X3 SW2,SW3 Just 3 off PTH SW057 SPDT switch wired to holes in PCB.
11 10k_LIN 1 POT_BITech-TTE_P160KN RV4 Various VR004 10k Lin pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
12 BC557 1 BC557 Q8 BC557B QD013 BC557 PNP BJT in TO-92 package.
13 DNF_51k 1 RC07 R10 Various DO NOT FIT IF SW2 AND LFO PARTS FITTED (10k 250mW Metal Film 2% or better.)
14 SWITCH_DPDT 1 HDR1X6 SW1 Just 6 off PTH. SW035 DPDT switch wired to holes in PCB.
15 47n 6 C_MLCC_RES_DIP_5.5x3mm_P5mm C17,C24,C8,C2,C18,C14 Various CC003 47nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
16 10R 3 RC07 R22,R13,R25 Various MR2510R 10R 250mW Metal Film 2% or better.
17 100k_LOG 2 POT_BITech-TTE_P160KN RV6,RV7 Various VR085 100k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
18 22n 1 C_MLCC_RES_DIP_5.5x3mm_P5mm C19 Various CC008 22nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
19 1u 12 C_ALUnTANT_D6n9mm_P1.5-5mm C11,C16,C10,C22,C15,C7,C6,C4,C3,C1,C12,C26 Various HC1U063 1uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
20 220u 1 C_ALUnTANT_D6n9mm_P1.5-5mm C20 Various LC220U35 220uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
21 47u 5 C_ALUnTANT_D6n9mm_P1.5-5mm C21,C23,C13,C27,C28 Various LC47U25 47uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
22 LED 1 LED3MM D1 Any 3mm lead spacing LED. (Almost any LED can be fitted if the leads are bent or wired to the PCB) OP009 Red 3mm LED with approx 2V forward drop.
23 10k_LOG 2 POT_BITech-TTE_P160KN RV5,RV3 Various VR099 10k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
24 1k 2 RC07 R23,R38 Various MR251K 1k 250mW Metal Film 2% or better.
25 SIP2 2 HDR1X2 P1,P2 Just 2 off PTH Wires can go straight to PCB.
26 LM386 1 DIP08 U2 LM386N-3 QU206 LM386 low power audio amplifier in 8 pin DIP package.
27 6.35mm_switched_3_pole_jack_skt_w-mono_plug 1 6.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2 SKT1 Neutrik NMJ6HFD2 or similar CN057 6.35mm switched 3 pole jack socket Neutrik NMJ6HFD2 showing use as power switch with mono plug.
28 6.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2 1 6.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2 SKT2 Neutrik NMJ6HFD2 or similar CN057 6.35mm switched 3 pole jack socket Neutrik NMJ6HFD2.
29 TL084N 2 DIP14 U1,U3 TL084CN QU111 TL084 quad opamp in 14 pin DIP package.
30 WIRE_LINK_or_SoT_CAP 1 C_MLCC_RES_DIP_5.5x3mm_P5mm C25 Various - Wire link or user choice of capacitor.
31 unplated_M3_clearance_hole 4 hole_3mm5 3M5_H1,3M5_H2,3M5_H3,3M5_H4 n/a You don't have to buy these: they come free with the PCB.

Attachments

Filename Download
Tesseract_front_view.JPG
bare_pcb_solder_side.JPG.JPG
Tesseract_back_view.JPG
DSC05051.JPG
Tesseract_top_view.JPG

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你现在访问的是EasyEDA海外版,使用建立访问速度更快的国内版 https://lceda.cn(需要重新注册)
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